Free Windows 7 Applications

Disk Space Fan is a nice disk space analysis tool for Windows 7. It helps you to free up disk space by quickly finding and deleting big, useless files. It also displays disk space usage with a nice chart.

KeePass is a free open source password manager, which helps you to manage your passwords in a secure way, supports 32/64 bit Windows 7

Process Explorer v11.33
Find out what files, registry keys and other objects processes have open,
which DLLs they have loaded, and more.
This uniquely powerful utility will even show you who owns each process.